PLANT-BASED RESIN FOR PAINTING

Abstract

A resin of vegetable origin for providing a paint, said resin comprising at least 51% by weight of linseed oil and a compound of vegetable origin selected from the group comprising rosin, abietic acid, dammar resin, copal resin, pine resin, shellac resin and mixtures thereof, characterized in that said resin has a kinematic viscosity at 40 °C of between 1500 and 15,000 mm² / s, preferably between 1500 and 10,000 mm² / s, more preferably between 1500 and 8000 mm² / s, more preferably still between 1500 and 7000 mm² / s, determined in accordance with ASTM D445-06.

Description

Title of the invention: VEGETABLE-BASED RESIN FOR PAINTING technical field

[0001] The present invention relates to a resin of plant origin for providing a paint, a bio-based paint comprising the resin according to the invention, the use of the resin, any product containing the resin and manufacturing processes.

[0002] Generally, paints include at least the following elements: a solvent, a pigment, a binder and additives.

[0003] The binder (or resin) is generally the main component of paint and allows the pigments to bind together once the paint is dry, thus forming a film on a substrate. Types of binders include alkyd, acrylic, polyurethane, and epoxy resins. It is possible to eliminate the need for organic solvents in the case of acrylic paints.

[0004] One of the major drawbacks of current paints is related to the presence of petroleum-based products, microplastics and preservatives which are endocrine disruptors.

[0005] Pigments are solid particles that give paint its color, opacity, and ability to protect surfaces. They can be organic, inorganic, natural, or synthetic. Titanium dioxide is widely used in paint compositions. It should be noted that regulations, particularly European ones, aim to increasingly reduce the pigment content, especially that of titanium dioxide.

[0006] Solvents (or thinners) dissolve the binder and facilitate the application of the paint. They evaporate once the paint has been applied. Water can be used as a solvent for water-based paints, while organic solvents such as white spirit or acetone are used for solvent-based paints.

[0007] Additives improve certain properties of the paint, such as durability, UV resistance, moisture resistance, and drying time. They include drying agents, anti-foaming agents, UV stabilizers, thickening agents, and dispersing agents.

[0008] Unfortunately, solvent-based paints release Volatile Organic Compounds (VOCs), which contribute to indoor and outdoor air pollution and can be harmful to human health. Furthermore, leftover paint and solvents used to clean tools are often considered hazardous waste.

[0009] Certain pigments and solvents can be toxic and cause skin irritation, respiratory problems, headaches, and other health issues. These chemical components can also contaminate soil and waterways, affecting flora and fauna.

[0010] Paints can degrade under the effects of UV radiation, humidity, and temperature variations, requiring repeated applications. Some paints are also difficult to clean and maintain, especially outdoors where climatic conditions are harsher.

[0011] Solvent-based paints can have long drying times, delaying project completion. In addition, solvents often give off strong and unpleasant odors, making paint application uncomfortable.

[0012] There are other alternative compositions.

[0013] Water-based paints contain fewer VOCs and are more environmentally friendly but are less effective because of the premature yellowing of the composition over time.

[0014] Solvent-free paints that use less toxic binders and pigments, or even so-called green ecological paints that are formulated from renewable and biodegradable raw materials, are options that are beginning to take shape on the market.

[0015] Unfortunately, current solutions are not yet sufficiently efficient in terms of quality, drying time, opacity, penetration, viscosity, and appearance (yellowing over time). Indeed, their performance depends heavily on the presence of petroleum-based additives, which constitute a source of environmental pollution.

[0016] There is therefore a real need to provide a resin of plant origin which alone can guarantee a whiteness which would be maintained over time, which would act as a binder without the addition of petroleum-based materials and which would allow control of drying time, viscosity, opacity, maintenance of its (white) color with little or no addition of petroleum-based additives. PRESENTATION OF THE INVENTION

[0017] To solve these problems, the present invention relates to a resin of vegetable origin for providing a paint, said resin comprising at least 51% by weight of linseed oil and a compound of vegetable origin selected from the group comprising rosin, abietic acid, dammar resin, copal resin, pine resin, shellac resin and mixtures thereof, characterized in that said resin has a kinematic viscosity at 40 °C of between 1500 and 15,000 mm² / s, preferably between 1500 and 10,000 mm² / s, more preferably between 1500 and 8000 mm2 / s, more preferably between 1500 and 7000 mm2 / s, determined according to the ASTM D445-06 standard.

[0018] Thus, the resin according to the invention makes it possible to produce a paint that exhibits the desired properties in terms of drying time, opacity, penetrability, viscosity, and whiteness (minimal yellowing). Furthermore, it has been observed that the resin according to the invention has a pasteurized character, which enhances its antibacterial properties and prevents the presence of substances responsible for endocrine disruption.

[0019] The supplied resin is thus pasteurized, making it an excellent base for manufacturing compositions intended for use in construction, particularly in the field of paint.

[0020] Preferably, the resin according to the invention is 100% of plant origin. The resin according to the invention preferably comprises 100% compounds of plant origin.

[0021] Surprisingly, it has been found that the resin is self-sufficient so that it is not necessary to add petroleum-based additives, particularly when forming a paint composition.

[0022] According to an advantageous mode, the resin according to the invention exhibits a result of at least 95%, preferably up to 100% in the C14 biogenic test according to standard EN 16 640.

[0023] Preferably, the resin according to the invention is obtained by plasma polymerization, preferably by cold plasma.

[0024] Advantageously, the resin according to the invention is substantially free of petroleum-based additives, that is to say, it contains less than 1% by weight of petroleum-based additives, preferably less than 0.01% by weight of petroleum-based additives, more preferably less than 0.001% by weight of petroleum-based additives.

[0025] Furthermore, the resin serves as a suitable base for the formation of a drying and opaque paint, while guaranteeing whiteness over time. This solves the problem of yellowing of currently used compounds.

[0026] Surprisingly, the resin according to the invention not only makes it possible to avoid the major use of petroleum-based binder (petroleum-based additives) but also to considerably reduce the titanium dioxide content in a paint composition, which is particularly surprising.

[0027] Furthermore, the resin according to the invention exhibits a result of at least 95%, preferably up to 100% in the C14 biogenic test according to standard EN 16 640, which makes it a perfect material for the manufacture of compositions intended for the field of construction, in particular in the manufacture of paint.

[0028] Preferably, the resin according to the invention can be obtained by cold plasma polymerization comprising the following steps:

[0029] Providing a plasma treatment chamber comprising a series of electrodes, preferably at least 5 electrodes being parallel to each other, for generating a plasma in a vacuum atmosphere, said plasma being arranged to be generated by electrical discharge, preferably DBD, in the presence of a plasmagen selected from the group comprising argon, helium, nitrogen, oxygen, air, hydrogen and mixtures thereof,

[0030] Mix at least 51% by weight, preferably at least 80% by weight of said linseed oil and less than 50% by weight, preferably less than 15% by weight, more preferably less than 10% by weight, more preferably still less than 5% by weight of said compound of vegetable origin selected from the group comprising rosin, abietic acid, dammar resin, copal resin, pine resin, shellac resin and their combination,

[0031] Introduce said mixture into said chamber and generate a plasma in the presence of said plasmagen until a kinematic viscosity at 40°C is reached between 1500 and 15,000 mm2 / s, preferably between 1500 and 10,000 mm2 / s, more preferably between 1500 and 8000 mm2 / s, more preferably still between 1500 and 7000 mm2 / s, determined according to ASTM D445-06 with formation of said resin.

[0032] In the context of the present invention, it has been found that the application of a cold plasma polymerization to a mixture comprising at least 51% by weight, preferably at least 80% by weight of said linseed oil and less than 50% by weight, preferably less than 15% by weight, more preferably less than 10% by weight, more preferably still less than 5% by weight of said compound of vegetable origin chosen from the group comprising rosin, abietic acid, dammar resin, copal resin, pine resin, shellac resin and their combinations makes it possible to provide a particularly advantageous resin, especially when used to manufacture a paint composition.

[0033] Preferably, said mixture consists of more than 80% by weight of said linseed oil and less than 20% by weight of said compound of vegetable origin selected from the group including rosin, abietic acid, dammar resin, copal resin, pine resin, shellac resin and their combination.

[0034] Advantageously, said mixture consists of more than 95% by weight of said linseed oil and less than 5% by weight of said compound of vegetable origin selected from the group including rosin, abietic acid, dammar resin, copal resin, pine resin, shellac resin and their combination.

[0035] According to a preferred method, at least 95% by weight, preferably at least 98% by weight of said linseed oil are mixed with less than 1% by weight, preferably less than 0.6% by weight of said compound of vegetable origin, preferably rosin.

[0036] Preferably, said compound of vegetable origin is rosin.

[0037] The invention also relates to a method for manufacturing the resin according to the invention, with the following steps: • Provide a plasma treatment chamber comprising a series of electrodes, preferably at least 5 electrodes being parallel to each other, for generating a plasma in a vacuum atmosphere, said plasma being arranged to be generated by electrical discharge, preferably DBD, in the presence of a plasmagen selected from the group comprising argon, helium, nitrogen, oxygen, air, hydrogen and mixtures thereof, • Mix at least 51% by weight, preferably at least 80% by weight of said linseed oil and less than 50% by weight, preferably less than 15% by weight, more preferably less than 10% by weight, more preferably still less than 5% by weight of said compound of vegetable origin selected from the group comprising rosin, abietic acid, dammar resin, copal resin, pine resin, shellac resin and combinations thereof, • Introduce said mixture into said chamber and generate a plasma in the presence of said plasmagen until a kinematic viscosity at 40°C is reached between 1500 and 15,000 mm2 / s, preferably between 1500 and 10,000 mm2 / s, more preferably between 1500 and 8000 mm2 / s, more preferably still between 1500 and 7000 mm2 / s, determined according to ASTM D445-06 with formation of said resin.

[0038] It has been found that the application of a cold plasma polymerization to a mixture comprising at least 51% by weight, preferably at least 80% by weight of said linseed oil and less than 50% by weight, preferably less than 15% by weight, more preferably less than 10% by weight, more preferably still less than 5% by weight of said compound of vegetable origin selected from the group comprising rosin, abietic acid, dammar resin, copal resin, pine resin, shellac resin and their combinations makes it possible to provide a particularly advantageous resin, especially when used to manufacture a paint composition.

[0039] Preferably, said mixture consists of more than 80% by weight of said linseed oil and less than 20% by weight of said compound of vegetable origin selected from the group including rosin, abietic acid, dammar resin, copal resin, pine resin, shellac resin and their combination.

[0040] Advantageously, said mixture consists of more than 95% by weight of said linseed oil and less than 5% by weight of said compound of vegetable origin selected from the group including rosin, abietic acid, dammar resin, copal resin, pine resin, shellac resin and their combination.

[0041] According to a preferred method, at least 95% by weight, preferably at least 98% by weight of said linseed oil are mixed with less than 1% by weight, preferably less than 0.6% by weight of said compound of vegetable origin, preferably rosin.

[0042] Preferably, said compound of vegetable origin is rosin.

[0043] The invention also relates to a bio-based paint comprising the resin according to the invention and further containing less than 30% by weight of titanium dioxide, preferably less than 20% by weight, more preferably less than 15% by weight, more preferably still less than 10% by weight, advantageously less than 5% by weight of titanium dioxide relative to the total weight of said paint or being substantially free of titanium dioxide.

[0044] Preferably, the paint according to the invention has a touch drying time of between 20 minutes and 10 hours, preferably between 20 minutes and 7 hours, more preferably between 20 minutes and 6 hours, or a core drying time of less than 48 hours, preferably less than 36 hours, more preferably less than 24 hours, which can be determined according to ASTM D5895.

[0045] More preferably, the paint according to the invention has a density between 0.5 and 3 g / cm3, preferably between 0.5 and 2 g / cm3, more preferably between 0.5 and 1.5 g / cm3.

[0046] According to a preferred mode, the paint according to the invention comprises less than 15% by weight of additives from the petrochemical sector, preferably less than 10% by weight, more preferably less than 5% by weight, relative to the total weight of paint.

[0047] More preferably, the paint according to the present invention comprises at least one of the elements included in the group comprising, possibly in powder form, eggshell, cellulose, talc, (mineral) fillers, etc.

[0048] The invention also relates to a product comprising the resin according to the invention.

[0049] The present invention also relates to a use of the resin according to the invention in the construction sector, particularly as a component of sealants, adhesives, wallpaper, ...

[0050] The term 'paint' or 'paint composition' as used in the present invention refers to a material which may include at least the resin according to the invention and optionally the following elements: pigment, solvent, bio-based additives, surfactant (bio-based).

[0051] The expression 'substantially free of titanium dioxide' means that the paint according to the invention may comprise less than 1% by weight of titanium dioxide, preferably less than 0.5% by weight of titanium dioxide, more preferably less than 0.05% by weight of titanium dioxide, expressed in relation to the total weight of the paint.

[0052] The term 'petroleum-based additive' or 'additive derived from the petrochemical industry' refers to additives that influence certain properties (such as durability, UV resistance, moisture resistance, and drying time) of paint or resin intended for use in construction, particularly in the field of paints. These additives may include drying agents, antifoaming agents, UV stabilizers, thickening agents, and dispersing agents. Within the scope of the present invention, any additive of this type or equivalent derived from the petrochemical industry is undesirable, or even to be excluded from the invention. Indeed, the paint or resin according to the invention performs well without the use of these petroleum-based additives or in a quantity of less than 1% by weight relative to the total weight of the paint or resin.

[0053] The percentages expressed within the framework of the present invention are expressed by weight and in relation to the total weight of the composition concerned unless otherwise stipulated.

[0054] The kinematic viscosity used in the context of the present invention is preferably determined according to ASTM D445-06 and at a temperature of 40 °C, unless otherwise specified. More preferably, standards NF EN ISO 2884-1 and 2884-2 may also be suitable.

[0055] The drying capacity expressed in the context of the present invention can be determined by the ASTM D5895 standard.

[0056] The opacity expressed in the context of the present invention can be defined according to standard NF T30-075.

[0057] The hardness expressed within the framework of the invention can be determined according to the standard NF EN ISO 1522.

[0058] The whiteness expressed within the framework of the present invention can be determined according to the standard FD X08-014.

[0059] The glass transition temperature Tg expressed in the context of the present invention can be determined by differential scanning calorimetry (DSC) analysis preferably according to the standard NF EN ISO 16805.

[0060] The density (g / cm3) expressed within the framework of the invention can be measured with a Gay-Lussac pycnometer according to ISO 2811 at 20 °C.

[0061] The invention provides a resin of vegetable origin which advantageously consists of at least 95% by weight, preferably at least 98% by weight, plus preferably at least 99% by weight of linseed oil and a maximum of 5% by weight, preferably less than 3% by weight, more preferably less than 2% by weight, more preferably still less than 1% by weight of rosin. Said percentages being expressed in relation to the total weight of said resin.

[0062] The resin according to the invention is then treated by cold plasma and after plasma treatment has a kinematic viscosity at 40 °C of between 1500 and 15,000 mm2 / s, preferably between 1500 and 10,000 mm2 / s, more preferably between 1500 and 8000 mm2 / s, more preferably still between 1500 and 7000 mm2 / s, determined according to ASTM D445-06.

[0063] The plasma-treated resin of the present invention is advantageous in that it can serve as a (main) binder in the manufacture of a paint.

[0064] This makes it possible to do away with a series of petroleum-based compounds.

[0065] Preferably, the resin can be emulsified using an aqueous medium or water, which is part of the general knowledge of a person skilled in the art. The emulsion can be stable and used to manufacture a paint.

[0066] Advantageously, the emulsion has a density between 0.5 and 200 g / cm3, preferably between 0.5 and 150 g / cm3, more preferably between 0.5 and 80 g / cm3, advantageously between 0.5 and 30 g / cm3, more advantageously between 0.5 and 10 g / m3, possibly measured with the Gay-Lussac pycnometer according to ISO 2811 at 20 °C.

[0067] A paint according to the invention may comprise between 5 and 40% by weight of water, preferably between 5 and 30% by weight of water, more preferably between 10 and 25% by weight of water, relative to the total weight of paint.

[0068] A paint according to the invention may comprise between 0.1 and 2% by weight of additives preferably bio-based such as thickeners, anti-foaming agents, dispersing agents, relative to the total weight of paint.

[0069] A paint according to the invention may comprise between 5 and 50% by weight, preferably between 5 and 30% by weight, of (mineral) fillers such as calcium carbonate.

[0070] A paint according to the invention may comprise between 5 and 30% by weight, preferably between 5 and 20% by weight of eggshell.

[0071] A paint according to the invention may comprise between 5 and 30% by weight of calcium sulfate or equivalent.

[0072] Thanks to the use of the resin according to the invention, it is possible to provide a paint whose titanium dioxide content is largely reduced, or even non-existent, compared to a paint available on the market, while benefiting from effective properties in terms of drying time, opacity, durability and maintenance of whiteness over time.

[0073] The paint according to the invention is thus substantially free of titanium dioxide, which means that the paint according to the invention may comprise less than 1% by weight of titanium dioxide, preferably less than 0.5% by weight of titanium dioxide, more preferably less than 0.05% by weight of titanium dioxide, expressed in relation to the total weight of the paint.

[0074] The paint according to the invention can thus be applied to all types of substrates, preferably those chosen from the group including plaster, coating, wood, plastic, metal, textile, ceramic, composite, resin, laminate, paper, cardboard, cement, brick and their combination.

[0075] The plasma is a cold plasma having a treatment chamber comprising a series of electrodes, preferably at least 5 electrodes parallel to each other. The plasma is generated in a vacuum atmosphere, preferably by electrical discharge, for example DBD. The plasma generator can be selected from the group comprising argon, helium, nitrogen, oxygen, air, hydrogen, and mixtures thereof.

[0076] Preferably, the plasma is implemented so as to reach a temperature between 10-100 °C, preferably between 40 and 100 °C within the enclosure.

[0077] Vacuuming is preferably carried out by applying a vacuum in the chamber of less than 1 mbar with a working pressure in said chamber between 50 and 250 mbar, preferably between 150 and 250 mbar.

[0078] The plasma is turned on by using a power source capable of providing a voltage which, when applied to the electrodes, is determined by applying Paschen's law.

[0079] Example 1 - resin

[0080] A mixture is prepared by adding 99.5% by weight of linseed oil and 0.5% by weight of rosin. This mixture is introduced into a plasma treatment chamber comprising at least five parallel electrodes. A plasma is generated in a vacuum atmosphere until a vacuum of less than 1 mbar is reached, with a working pressure then established within the chamber at 200 mbar and a temperature of 70°C, by DBD electrical discharge in the presence of a plasma generator selected from the group comprising argon, helium, nitrogen, oxygen, air, hydrogen, and mixtures thereof. This enables plasma polymerization, which brings the mixture to a kinematic viscosity of approximately 6300 mm² / s measured at 40°C. The resin thus obtained can be used as a binder for a paint composition.

[0081] The supplied resin is pasteurized, which makes it an excellent base for manufacturing compositions intended for use in construction, particularly in the field of paint.

[0082] Example 2 - painting

[0083] The resin of Example 1 is mixed with a thickener, an anti-foaming agent, a dispersing agent, precipitated calcium carbonate, eggshell and calcium sulfate to form vegetable and ecological paint which is substantially free of titanium dioxide.

[0084] The drying time of this paint on plaster is less than 30 minutes to the touch (on the surface) and less than 24 hours to the core.

[0085] No yellowing appears after 1 month of application.

[0086] Comparative example

[0087] A mixture is prepared by adding 40% by weight of linseed oil and 60% by weight of rosin. This mixture is introduced into a plasma treatment chamber comprising at least five parallel electrodes. A plasma is generated in a vacuum atmosphere by DBD electrical discharge in the presence of a plasma generator. Plasma polymerization leads to the formation of a product with an unsuitable viscosity. This makes it impossible to obtain a resin suitable for paint manufacturing.

[0088] The expressions "in an embodiment," "according to an embodiment," and others generally mean that the particular feature, structure, or characteristic referred to in the expression is included in at least one embodiment of this disclosure, and may be included in more than one embodiment of this disclosure. It is important to note that such expressions do not necessarily refer to the same embodiment.

[0089] If the text indicates that a component or feature "may" or "could" be included or have a feature, it is not necessary that this particular component or feature be included or have the feature.

[0090] If it appears here, the term "comprising" or "containing" and derivatives thereof are not intended to exclude the presence of any additional component, step, or procedure, whether or not disclosed herein. For the avoidance of doubt, the term "comprising" may include any additional element / additive, adjuvant, or compound, unless otherwise specified. By contrast, the term "essentially consisting of," if it appears here, excludes from the scope of any subsequent quotation any other component, step, or procedure, except those not essential to operability, and the term "consisting of," if used, excludes any component, step, or procedure not specifically defined or indicated. The terms "or" and "and / or," unless otherwise specified, refer to the members indicated individually as well as in any combination. For example, the expression A and / or B refers to A alone, B alone, or A and B.Furthermore, the term and any equivalent to "comprising" can be replaced by "consisting of".

[0091] Also, the terms "obtainable" or "can be obtained" or any similar or derived expression may be replaced by "directly obtained".

[0092] It is understood that the present invention is in no way limited to the embodiments described above and that many modifications can be made to it without departing from the scope of the annexed claims.

Claims

Demands

1. A resin of vegetable origin for providing a paint, said resin comprising at least 51% by weight of linseed oil and a compound of vegetable origin selected from the group comprising rosin, abietic acid, dammar resin, copal resin, pine resin, shellac resin and mixtures thereof, characterized in that said resin has a kinematic viscosity at 40 °C of between 1500 and 15,000 mm2 / s, preferably between 1500 and 10,000 mm2 / s, more preferably between 1500 and 8000 mm2 / s, more preferably still between 1500 and 7000 mm2 / s, determined in accordance with ASTM D445-06.

2. Resin according to claim 1, being obtained by plasma polymerization, preferably by cold plasma.

3. Resin according to any one of the preceding claims, being obtained by cold plasma polymerization comprising the following steps: • Providing a plasma treatment chamber comprising a series of electrodes, preferably at least 5 electrodes being parallel to each other, for generating a plasma in a vacuum atmosphere, said plasma being arranged to be generated by electrical discharge, preferably DBD, in the presence of a plasma generator selected from the group comprising argon, helium, nitrogen, oxygen, air, hydrogen and mixtures thereof, • Mixing at least 51% by weight, preferably at least 80% by weight of said linseed oil and less than 50% by weight, preferably less than 15% by weight, more preferably less than 10% by weight, more preferably still less than 5% by weight of said compound of vegetable origin selected from the group comprising rosin, abietic acid, dammar resin,Copal resin, pine resin, shellac resin and their combination, • Introduce said mixture into said chamber and generate a plasma in the presence of said plasma generator until a kinematic viscosity at 40°C is reached between 1500 and 15,000 mm2 / s, preferably between 1500 and 10,000 mm2 / s, s, more preferably between 1500 and 8000 mm2 / s, more preferably between 1500 and 7000 mm2 / s, determined according to ASTM D445-06 with formation of said resin.

4. Resin according to any one of the preceding claims, wherein at least 95% by weight, preferably at least 98% by weight of said linseed oil are mixed with less than 1% by weight, preferably less than 0.6% by weight of said compound of vegetable origin, preferably rosin.

5. A bio-based paint comprising the resin according to any one of the preceding claims and further containing less than 30% by weight of titanium dioxide, preferably less than 20% by weight, more preferably less than 15% by weight, more preferably still less than 10% by weight, advantageously less than 5% by weight of titanium dioxide relative to the total weight of said paint or being substantially free of titanium dioxide.

6. Paint according to claim 5, comprising less than 15% by weight of additives from the petrochemical sector, preferably less than 10% by weight, more preferably less than 5% by weight, relative to the total weight of paint.

7. Product comprising the resin according to any one of claims 1 to 4.

8. Use of the resin according to any one of claims 1 to 4 in the field of construction, more particularly as a component of sealants, glues, wallpaper.